Brushless dc motor controller is applied more and more widely, we often cannot be started when in use, it is carried out in accordance with the instructions, how to still don't start? 1, lack of power supply likely scenario: such as the power switch before not good, fuse fusing, motor controller of main circuit and control circuit fuse fusing, contactor and other power control device failure and line wire broken or loose, etc. Treatment method is used to grade fuse to check step by step to the motor controller all the parts of the main circuit and control circuit conductor and device, find out the reason and repair. 2, motor controller failure likely scenario: brush wear serious, jam, spring pressure is not enough to brush and commutator poor contact; The armature winding broken; Excitation winding is disconnected and no residual magnetism, etc. Processing method is to disconnect the power supply, multimeter is the resistance of the file to check the contact resistance between brush and commutator segment, at both ends of the winding resistance. Such as the resistance value is very big shows fault exists, for further inspection, find the breakpoint to repair. 3, mechanical failure motor controller with mechanical equipment or actuator stuck, starting under the heavy load, etc. Then the power should be quickly removed, search a mechanical failure. Above is about several causes of brushless dc motor controller cannot be started, we use the check above question before, if still won't start, after the inspection, then don't repair themselves, directly find repair professional and technical personnel, to prevent improper maintenance, greater failure. Small make up: Sara
